Yes the 2012 Panasonic plasma 3D HDTVs have a motion smoothing option that can be set to OFF, WEAK, MEDIUM, or STRONG.
So you can turn it OFF for no frame interpolation like with 24fps movies.
Or you can increase the setting to get more of a video/soap-opera effect as desired, it can be made quite strong if you want. I prefer it not too strong so use weak or medium.
I don't believe the Samsung plasmas have a frame interpolation feature at all.